package com.foreknow.demo1;

import java.util.Scanner;

public class Test {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);

        System.out.print("请输入月份：");
        int month = scanner.nextInt();

        System.out.print("请输入年份：");
        int year = scanner.nextInt();

        int days = 0;

        switch (month) {
            case 1:
            case 3:
            case 5:
            case 7:
            case 8:
            case 10:
            case 12:
                days = 31;
                break;
            case 4:
            case 6:
            case 9:
            case 11:
                days = 30;
                break;
            case 2:
                if ((year % 4 == 0 && year % 100 != 0) || (year % 400 == 0)) {
                    days = 29;
                } else {
                    days = 28;
                }
                break;
            default:
                System.out.println("输入的月份无效！");
                return;
        }

        System.out.println(year + "年" + month + "月有" + days + "天。");
    }
    }

